Auto merge of #110413 - pietroalbini:pa-1.69.0-stable, r=pietroalbini1.69.0stable

[stable] Prepare Rust 1.69.0

Last minute backports:

*  #109643
* #110135
* #109938
* #109937
* #109266

This PR also bumps the channel to stable, and backports the release notes from master.

r? `@ghost`
cc `@rust-lang/release`

2 files changed, 11 insertions, 34 deletions

diff --git a/compiler/rustc_lexer/src/lib.rs b/compiler/rustc_lexer/src/lib.rs
index 322ec31fb2c..b3f4b5cd5e5 100644
--- a/compiler/rustc_lexer/src/lib.rs
+++ b/compiler/rustc_lexer/src/lib.rs
@@ -95,7 +95,7 @@ pub enum TokenKind {
     Literal { kind: LiteralKind, suffix_start: u32 },
 
     /// "'a"
-    Lifetime { starts_with_number: bool, contains_emoji: bool },
+    Lifetime { starts_with_number: bool },
 
     // One-char tokens:
     /// ";"
@@ -632,13 +632,7 @@ impl Cursor<'_> {
             // If the first symbol is valid for identifier, it can be a lifetime.
             // Also check if it's a number for a better error reporting (so '0 will
             // be reported as invalid lifetime and not as unterminated char literal).
-            // We also have to account for potential `'🐱` emojis to avoid reporting
-            // it as an unterminated char literal.
-            is_id_start(self.first())
-                || self.first().is_digit(10)
-                // FIXME(#108019): `unic-emoji-char` seems to have data tables only up to Unicode
-                // 5.0, but Unicode is already newer than this.
-                || unic_emoji_char::is_emoji(self.first())
+            is_id_start(self.first()) || self.first().is_digit(10)
         };
 
         if !can_be_a_lifetime {
@@ -651,33 +645,16 @@ impl Cursor<'_> {
             return Literal { kind, suffix_start };
         }
 
-        // Either a lifetime or a character literal.
+        // Either a lifetime or a character literal with
+        // length greater than 1.
 
         let starts_with_number = self.first().is_digit(10);
-        let mut contains_emoji = false;
 
-        // FIXME(#108019): `unic-emoji-char` seems to have data tables only up to Unicode
-        // 5.0, but Unicode is already newer than this.
-        if unic_emoji_char::is_emoji(self.first()) {
-            contains_emoji = true;
-        } else {
-            // Skip the literal contents.
-            // First symbol can be a number (which isn't a valid identifier start),
-            // so skip it without any checks.
-            self.bump();
-        }
-        self.eat_while(|c| {
-            if is_id_continue(c) {
-                true
-            // FIXME(#108019): `unic-emoji-char` seems to have data tables only up to Unicode
-            // 5.0, but Unicode is already newer than this.
-            } else if unic_emoji_char::is_emoji(c) {
-                contains_emoji = true;
-                true
-            } else {
-                false
-            }
-        });
+        // Skip the literal contents.
+        // First symbol can be a number (which isn't a valid identifier start),
+        // so skip it without any checks.
+        self.bump();
+        self.eat_while(is_id_continue);
 
         // Check if after skipping literal contents we've met a closing
         // single quote (which means that user attempted to create a
@@ -687,7 +664,7 @@ impl Cursor<'_> {
             let kind = Char { terminated: true };
             Literal { kind, suffix_start: self.pos_within_token() }
         } else {
-            Lifetime { starts_with_number, contains_emoji }
+            Lifetime { starts_with_number }
         }
     }
 
diff --git a/compiler/rustc_lexer/src/tests.rs b/compiler/rustc_lexer/src/tests.rs
index 670d64fb983..e4c1787f2cc 100644
--- a/compiler/rustc_lexer/src/tests.rs
+++ b/compiler/rustc_lexer/src/tests.rs
@@ -235,7 +235,7 @@ fn lifetime() {
     check_lexing(
         "'abc",
         expect![[r#"
-            Token { kind: Lifetime { starts_with_number: false, contains_emoji: false }, len: 4 }
+            Token { kind: Lifetime { starts_with_number: false }, len: 4 }
         "#]],
     );
 }